RF insulation value of concrete?

[Jack Johnsrud]

Can concrete serve as an adequate rf insulator?

I am wondering if I might be able to use and existing 35 ft. heavy duty steel (?) flagpole as an antenna if an antenna tuner is used. Would like to use it for 10 meters. It is mounted with four 1 inches bolts into the concrete through a 1.5 x 1.5 ft. steel plate. Stacked 4" sq. steel plates were used under the base to level it. The bolts pass through these so the base plate is actually 1/2 inch above the concrete. The concrete base it sits on is a three cubic foot square pf poured concrete. I suppose the moisture of the concrete might make a difference. Use rubber washers or some such? Or paint the whole concrete base with a rubberized coating to keep it dry--but it might absorb moisture from the contact point of the base to the earth--or would it not absorb enough to make a difference. It sits on fairly dry, well drained sandy soil.

Please set me stright if this is a dumb idea. Just a novice here.

Thanks.

PS: Thanks to the last guy who answered my question about antennas being looped in the attic. I'll just stick with a tunable dipole. Lost your reply after reading it.

[k9yli]

look up shunt feeding a tower in the Handbook or elsewhere.
Shunt feeding is a way to feed a grounded radiator.